Hi Moris! You .conf is almost good, but leave the blanks out! It's not: fba.shaders = / recalbox / share / shaders / shaders_glsl / crt-pi.glsl but # ------------ I - EMULATORS CHOICES ----------- # ## You can override the global configuration here ## Here is the snes example ;snes.videomode=CEA 4 HDMI snes.core=snes9x_next ;snes.shaders=/recalbox/share/shaders/shaders_glsl/mysnesshader.gplsp ;snes.ratio=16/9 snes.smooth=1 ;snes.rewind=1 ;snes.autosave=0 snes.emulator=default ## If you do not want recalboxOS to generate the configuration for the emulator : ;snes.configfile=/path/to/my/configfile.cfg ## Default Shader for MAME mame.shaders=/recalbox/share_init/shaders/crt-pi.glslp ## Default Shader for FBA and FBA_LIBRETRO fbalibretro.shaders=/recalbox/share_init/shaders/crt-pi.glslp fba.shaders=/recalbox/share_init/shaders/crt-pi.glslp This configuration is for recalbox v4 and the unzipped folder structure should be /recalbox/share_init/shaders/crt-pi.glslp /recalbox/share_init/shaders/crt-pi-barrel.glslp /recalbox/share_init/shaders/crt-pi-mask.glslp and /recalbox/share_init/shaders/shaders/crt-pi.glsl /recalbox/share_init/shaders/shaders/crt-pi-barrel.glsl /recalbox/share_init/shaders/shaders/crt-pi-mask.glsl